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2 (Dicyanomethylene)croconate

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2-(Dicyanomethylene)croconate

2-(Dicyanomethylene)croconate is a divalent anion with chemical formula C
8
N
2
O2−
4
or ((N≡C−)2C=)(C5O4)2−. It is one of the pseudo-oxocarbon anions, as it can be described as a derivative of the croconate oxocarbon anion C
5
O2−
5
through the replacement of one oxygen atom by a dicyanomethylene group =C(−C≡N)2.

The anion was synthesized and characterized by A. Fatiadi in 1980, by hydrolysis of croconate violet treated with potassium hydroxide. It gives an orange solution in water.

References

2-(Dicyanomethylene)croconate Wikipedia


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